Hello there, @Ask4Noah. Thanks for joining the thread and bringing this to our attention.

To ensure we're on the same page, can you verify what projects not showing on the overview? Are these expenses? Also, have you done performing the troubleshooting steps provided by my colleagues above, which is to access your account via a private window? If not, I suggest doing it. 

However, if yes and the issue persists, this time, I recommend deleting and recreating the project. 

In the meantime, for more information on adding existing transactions to a project in QuickBooks, see this article: Set up and create projects in QuickBooks Online.

Please let me know how things go on your end. I want to ensure this gets resolved for you. Have a great day.